Lift Circuit (Machine Serial Number Below 311000000) - Toro Groundsmaster 3280-D Service Manual

Lift Circuit (Machine Serial Number below 311000000)

Raise Cutting Deck (or Implement)
g229583
Groundsmaster ® 3280-D/3320
05138SL Rev B
The hydrostatic transmission charge pump supplies charge oil for the closed
loop traction circuit in addition to supplying flow for the steering circuit and the
lift circuit. The charge pump takes its suction through a filter from the reservoir
(front axle). Pump output flows to the steering control valve before reaching the
lift valve so the steering circuit has priority. Lift circuit pressure is limited to 5,515
kPa (800 psi) by the implement relief valve located in the hydrostat.
During conditions of not steering or operating the lift valve, flow from the charge
pump passes through the lift and counterbalance valves, then on to the oil cooler
and then to the reservoir (front axle).
Figure 50
Page 5–27 Hydraulic System: Hydraulic Flow Diagrams